ID   CA1B_CONRE              Reviewed;          12 AA.
AC   P85009;
DT   31-OCT-2006, integrated into UniProtKB/Swiss-Prot.
DT   31-OCT-2006, sequence version 1.
DT   23-FEB-2022, entry version 39.
DE   RecName: Full=Alpha-conotoxin-like Reg1b/Reg1c {ECO:0000303|PubMed:17153339};
OS   Conus regius (Crown cone).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Stephanoconus.
OX   NCBI_TaxID=101314;
RN   [1]
RP   PROTEIN SEQUENCE, SUBCELLULAR LOCATION, TISSUE SPECIFICITY, HYDROXYLATION
RP   AT PRO-6, AND AMIDATION AT CYS-12.
RC   TISSUE=Venom;
RX   PubMed=17153339; DOI=10.1007/978-3-540-30880-5_4;
RA   Franco A., Pisarewicz K., Moller C., Mora D., Fields G.B., Mari F.;
RT   "Hyperhydroxylation: a new strategy for neuronal targeting by venomous
RT   marine molluscs.";
RL   Prog. Mol. Subcell. Biol. 43:83-103(2006).
CC   -!- FUNCTION: Alpha-conotoxins act on postsynaptic membranes, they bind to
CC       the nicotinic acetylcholine receptors (nAChR) and thus inhibit them.
CC       {ECO:0000250|UniProtKB:P50983}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:17153339}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom duct.
CC       {ECO:0000269|PubMed:17153339}.
CC   -!- DOMAIN: The cysteine framework is I (CC-C-C). Alpha4/3 pattern.
CC       {ECO:0000305}.
CC   -!- PTM: Occurs in 2 forms, Reg1b has a 4-hydroxyproline at Pro-6, Reg1c
CC       contains unmodified proline at Pro-6. {ECO:0000269|PubMed:17153339}.
CC   -!- SIMILARITY: Belongs to the conotoxin A superfamily. {ECO:0000305}.
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DR   ConoServer; 28; Reg1b/Reg1c.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0035792; C:host cell postsynaptic membrane; IEA:UniProtKB-KW.
DR   GO; GO:0030550; F:acetylcholine receptor inhibitor activity; IEA:UniProtKB-KW.
DR   GO; GO:0099106; F:ion channel regulator activity; IEA:UniProtKB-KW.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Acetylcholine receptor inhibiting toxin; Amidation;
KW   Direct protein sequencing; Disulfide bond; Hydroxylation;
KW   Ion channel impairing toxin; Neurotoxin; Postsynaptic neurotoxin; Secreted;
KW   Toxin.
FT   PEPTIDE         1..12
FT                   /note="Alpha-conotoxin-like Reg1b/Reg1c"
FT                   /evidence="ECO:0000269|PubMed:17153339"
FT                   /id="PRO_0000259385"
FT   MOD_RES         6
FT                   /note="4-hydroxyproline; in form Reg1b"
FT                   /evidence="ECO:0000269|PubMed:17153339"
FT   MOD_RES         12
FT                   /note="Cysteine amide"
FT                   /evidence="ECO:0000269|PubMed:17153339"
FT   DISULFID        2..8
FT                   /evidence="ECO:0000250|UniProtKB:P0C1D0"
FT   DISULFID        3..12
FT                   /evidence="ECO:0000250|UniProtKB:P0C1D0"
SQ   SEQUENCE   12 AA;  1337 MW;  9C2B0C3BA5A4176A CRC64;
     GCCSDPRCKH QC